Start-stop teleprinter receivers



H. WUSTENEY EI'AL 2,795,647 START-STOP TELEPRINTER RECEIVERS June 11, 1957 Filed March 21, 1955 2 Shee'ts-Sheet l N m a 1'NVENTORS HERBERT WUSTENEY ROBERT STABENAU BY W g 4 v ATTORNEY June 11, 1957 Filed March 21, 1955 H. WUSTENEY ETAL START-STOP TELEPRINTER RECEIVERS 2 Sheets-Sheet 2 I u INVENTORS HERBERT WUJTENEY ROBERT STABENAU BY 2 ATTORNEY Unite START-STOP T ELEPRINTER RECEIVERS Herbert Wiisteney, Munich-Thalkirchen, and Robert Stabenau, Munich, Germany, assignors to Siemens & Halske Aktiengesellschaft, Munich and Berlin, Germany, a corporation of Germany This invention relates to teleprinter receivers and is particularly concerned with start-stop teleprinter receivers comprising two receiver magnets, the armature of one of the magnets serving for releasing the receiver shaft for operation prior to the start of an impulse series, the armature positions of the second magnet being scanned depending on the angular positions of the receiver shaft, and having adjusting means for variably spacing the scanning instants relative to the instant of operative release of the receiver shaft while retaining the spacing between the individual scannin operations.

Prior adjusting means provided two intermediate levers in the release mechanism, with one of such levers adjustable directly by the armature of a fixedly disposed release magnet and the other lever disposed radially of the receiver shaft with its journal movably pivoted on such shaft. Both levers cooperated so as to provide for mutual interaction in axial direction. Such structures require complicated gearing between the levers and arrangement of the release mechanism at one end of the receiver shaft. These requirements pose for the construction of the entire machine undesired structural problems.

The invention avoids or largely diminishes these drawbacks in teleprinter receivers of the previously indicated kind by the provision of control means for adjusting the position of the release magnet and of the release mechanism (comprising, -or example, a stop pawl controlled by the armature for releasing a dog on the receiver shaft) relative to the initial or start position of the receiver shaft and especially by the provision of control means for pivotally adjusting such parts about the axis of the receiver shaft. The desired initial or start position of the receiver shaft is in this manner determined without requiring separate adjustment, in any manner, of parts of the simply constructed release mechanism one relative to the other.

In accordance with a further object and feature of the invention, the elements which are to be adjusted responsive to shifting of the scanning instants of the signal impulses, are arranged upon a preferably plane holder which is disposed perpendicular to the receiver shaft, and such holder is manually adjustable responsive to release of an associated locking means.

The holder or an element fixedly connected therewith forms a member, for example, a scale or a pointer constituting part of a device for accurately indicating the receiver setting or adjustment effected by the holder.

In accordance with another feature of the invention, the holder for the release magnet and the release mechanism may be locked or fixed in its angularly adjusted position.

The holder may be coupled substantially without play with an adjusting shaft carrying an actuating member, for example, a handle or the like and easily operable means may be provided if desired, for releasably securing the adjusting shaft to a structural part of the machine, for example, to the frame thereof.

The windings of the release magnet and of the scanning magnet for the signal impulses are in accordance with States Patent 2 another feature connected in series in the signal circuit. Fluctuations in the inductance of the receiver circuit are thereby greatly reduced as compared with fluctuations occurring in known receiver circuits in which the two magnets are alternately actuated.

The foregoing and additional objects and features will appear from the description which will be rendered with reference to the accompanying diagrammatic drawings, in which- I Fig. 1 illustrates a first embodiment of a start-stop teleprinter receiver showing essential parts for variably adjusting the spacing between the instant of operable release of the receiver shaft and the instant of scanning the armature of the receiver magnet; and

Fig. 2 shows a second embodiment indicating essential parts for the purpose referred to.

The start-stop telepn'nter receiver according to Fig. 1 comprises a drive shaft 1. Disposed adjacent a journal mounting 2 for such shaft is a platelike part 3 which is pivotally movable about the shaft 1. The shaft 1 drives a receiver shaft 5 which is coupled therewith by means of a clutch 4. Fixedly connected with the shaft 5 is a stop lever 6 carrying a stop pawl 6a. The platelike part 3 forms a holder for the elements comprising a receiver magnet 7, a bolt 9 serving as a pivot axis for the associated armature 8, a bolt 10 about which is pivoted a release lever 11, two further bolts 12 and 13 likewise forming pivots, and three stops 14, 15 and 16. A locking pawl 17 cooperating with the stop pawl 6a is pivotally movable about the bolt 12 and is locked in the normal position shown by the release lever 11. Two levers 18 and 19, which are fixedly connected together, are pivotally movable about the bolt 13. The lever 18 extends with its free end into the path of the armature 8 and the other lever 19 is arranged for counterclockwise displacement by the stop pawl 6a at the end of the rotation of the shaft 5. The lever 18 thereby presses the armature 8 in the direction of and against the core of the magnet '7, opposing the force of the spring 20 which attempts to hold the armature 8 in released position and also opposing the force of the spring 21 which biases the lever 18. The receiver shaft 5 carries in usual manner scanning cams 22 which cooperate with pivotally movable scanning levers 23. During each revolution of the shaft 5, the lovers 23 are displaced once so as to move the free ends thereof relative to the respectively associated armature 24 controlled by the second magnet 25. The holder 3, forming the adjusting means and carrying a pointerlike extension 3a, may be rotated about the shaft 1 after release of suitable not illustrated means which is adapted to secure it in connection with the journal mounting 2 provided with a scale 26 which is concentric with the shaft 1, the pointer 3a coacting with the scale to indicate the adjusted angular position of the holder 3 relative thereto.

The windings of the two receiver magnets 7 and 25 may be connected in series by known and suitable not illustrated means. The inductance in the receiver circuit is thereby reduced and inductance fluctuations will be of substantially identical magnitude.

The operation is as follows:

The receiver mechanism is shown with its parts in normal or resting position. Upon interruption of the current flowing in the windings of the receiver magnets, the corresponding armatures 24 and 8 will restore. Restoration of the armature 8 causes rotation of the release lever 11 in counterclockwise direction against the force exerted by the spring 27. The ear 11a extending from the lever 11 thereby frees the stop lever which is held in engagement therewith by the force exerted on the pawl 6a by the spring 28. The torque on the receiver arouse? shaft 5 overcomes the, force of this spring 28 and such shaft can accordingly begin its rotation.

Shortly before the receiver shaft 5 concludes one revolution, namely, in thejstop step, the step pawl 6a will assume a position with its upper edge underneath the free end of the arcuate extension 19a of the lever 19, lifting the extension 19a and thereby swinging the lever 18 to move the armature to the illustrated position into engagement with the core of the magnet 7. Before such operation, the armature 8 had been in engagement with the stop 14 except during its attracted condition responsive to signal impulses which does not affect the release mechanism. The locking pawl 17 is pulled in engagement with the stop 15 by the spring 28 shortly after start of rotation of the receiver shaft. The release lever 11 is freed upon reengagement of the armature 8 with the core of its magnet 7 and such lever 11 is accordingly placed in engagement with its stop 14 by the force exerted by the spring 27. This operation prevents locking of the pawl 6a of the stop lever 6 by the release lever 11 prior to engagement thereof with the pawl of lever 17. Thejreceiver shaft 5 can accordingly execute another revolution only responsive to subsequent deenergization of the magnet 7.

If it is during a service test or in the course of actual operation found that the scanning elements are not affected at m-idpoints of the respective received impulses, all that is necessary is to release the adjusting means, that is, the holder 3 and to rotate it into another angular position relative to the journal mounting 2 and its associated scale 26, using the pointer 3a as a guide. The initial or start position of the receiver shaft is thus in simple manner adjustable.

The apparatus shown in Fig. 2 is similar to the one illustrated in Fig. 1. The corresponding start-stop teleprinter receiver comprises a receiver shaft 31 with an associated stop cam 32, an armature restoring cam 33 and a plurality of scanning control earns 34. The earns 32 and 33 are allotted to a first receiver magnet 35, forming the release magnet, having an armature 36 for releasing the receiver shaft 31 for operation. The cams 34 of which only some are shown cooperate with the second receiver magnet 37, forming the scanning control magnet, having an armature 38. The release magnet 35 and a bolt ii) forming a pivot for the armature 36 are together with a bolt 41 acting as a pivot for the stop pawl 39 and together with a stop 42 fastened on a platelike adjusting member or holder 43 which is pivotally rotatable about the axis of the receiver shaft 31. The holder 43 is provided with an arcuate scale 44 cooperating with a suitably fixed pointer 45. The armatures 36 and 38 are biased to normal positions by springs 46 and 48 respectively associated therewith. A spring 49 holds the stop pawl 39 in engagement with the stop cam 32 and the stop 42, respectively. A double-armed release lever 50 is also rotatable about the pivot bolt 40 and is by a spring 47 held in engagement with the stop pawl 39 and the armature 36, respectively.

A shaft 51, forming an adjusting member, is angularly adjustable by means of the handle '52 after loosening a setting screw 53 which is provided for securing the shaft in angular adjusted position relative to a suitable structural part of the machine. The shaft 51 carries a gear wheel 54 which meshes substantially without play with teeth 43a carried upon part of the holder 43 peripherally thereof. This mechanism provides for adjustment in different angular positions of the platelike holder 43 and therewith also of the stop position of the receiver shaft.

The operation of the arrangement according to Fig. 2 is as follows:

The various parts of the receiver mechanism are again shown in normal or resting position. Upon interruption of the current flowing in the windings of the magnets 35 an 37, the armatures 38 and 36 will restore. The armature' 36 causes upon restarting counterclockwise displacement ofthe release lever 50 against the force exerted by the spring 47. The pawl 50;: thereby frees the stop pawl 39 which had been held in engagement therewith by the force of the spring 49. The torque of the receiver shaft overcomes the force of the spring 49 and can accordingly begin its rotation. Shortly before conclusion of a revolution of the receiver shaft 31, namely, in the stop step, the extension 36a of the armature, 36 will be positioned in the path of the restoring cam 33. The latter lifts the armature 36 and places it again in engagement with the magnet 35. The stop pawl had been previously pulled against the stop 42 by the spring 49, after leaving the cam 32, and the release lever 50 which is held in engagement with the armature 36, by the spring 47, can accordingly follow this motion nearly to the end thereof. The lever 50 thereby locks the stop pawl 39 in the stop position upon reengagement of the cam 32 with such pawl. it will be seen therefore that the receiver shaft can execute another revolution only upon renewed release of the magnet 35. p I g If it is desired to adjust the scanning instants relative to the instant of operative release of the receiver shaft, all that is necessary is to loosen the screw 53 and to operate thereupon the handle 52 so as to rotate the shaft 51 and pinion 54 for the purpose of angularly adjusting the platelike adjusting member or holder 43 relative to the pointer 45 cooperating with the scale 44. The start or initial position of the receiver shaft is in this simple manner easily adjustable. After the adjustment is effected, the screw 53 may be tightened again so as to secure it against undesired displacement. The arrangement of the scale directly upon the holder permits to ascertain its angular position by direct reading; the manual adjustment may however be effected at any desired and easily accessible point of -the apparatus.

The converter mechanism for the teleprin'ter signal impulses does not form part of the invention and has therefore been omitted.

It-is understood, of course, that the invention maybe realized in different manner. The release mechanism for the receiver shaft may for example assume different form; the adjustment may likewise be effected differently, for example, over a worm drive, and the various structural parts may be of different configuration.

Qhanges may accordingly be made within the scope and spirit of the appended claims.

We claim: 7

1. In a start-stop teleprinter receiver having a receiver shaft and a first magnet and having release control means and an armature controlled by said first magnet for operatively affecting said release control means to release said shaft for operation and having a second magnet and armatures associated therewith the positions of which are scanned at instants depending on the angular position of said receiver shaft, a device for variably adjusting the spacing between the instant of operable release of said receiver shaft and the instant of scanning said device comprising common holder means for said first magnet and for said release control means, and means for adjustably disposing said holder to effect adjustment of the positions of said first magnet and said release control means relative to the angular start position of said receiver shaft.

2. The structure and cooperation of parts as defined in claim 1, wherein said holder is rotatable about an axis coinciding with the axis of said receiver shaft.

3. The structure and cooperation of parts as defined in claim 2, wherein said holder is a generally platelike manually angularly adjustable member disposed perpendicular to the axis of said receiver shaft, and means for securing said holder in adjusted angular position against inadvertent displacement.

4. The structure and cooperation of parts as defined in claim 3, comprising an indicating device for indicating the adjusted angular position of said holder, said holder forming part 6f said indicating device.

5 5. The structure and cooperation of parts as defined in References Citedin the file of this patent claim 2, wherein said holder is a generally platelike mem- UNITED STATES A ber extending substantially perpendicular to the axis of 1 052 548 w h F b 1 1913 I said receiver shaft and being rotatable about an axis cog f g inciding with the axis of said receiver shaft, actuating 5 et 1 1 4 means coupled with said holder substantially without enne'r 19 1 121 d m for o eratin said actuatin means 1 2315009 Noxon 1943 t p an em g 8 2,331,016 Dove Oct. 5, 1943 ad ust the angular positlon of said holder. 2,351,137 Long June 13 1944 2,610,247 Wusteney Sept. 9, 1952 

